Type-writing and computing machine.



G. J. BARRETT. TYPE WRITING ANDGOMPUTING MACHINE. I

APPLICATION FILED AUGJB, 1911.

Patented Apr. 1, 1913;

8 SHEETS-SHEET 1.

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F/GHZ I 5? r-- WITNESSES: NVENTEIRi,

a. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED AUG. 18, 1911.

' Patented Apr. 1, 19.13.

B SHEETS-SHEET 2.

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE. APPLIGATTON FILED AUG. 18,1911.

1,057,915. r I Patented Apr. 1,1913.

8SHEETS -SHBET 3.

7/! 5W N v D A TTORN]; Y.

G. J. BARRETT. TYPE WRITING AND COMPUTING MAQHINE.

APPLICATION FILED AUG. 18, 1911.

' Patented Apr. 1, 1913.

ZZESSES; flaw M,

I f I ATTORIYEY.

G. J. BARRETT.. TYPE WRITING AND COMPUTINGMACHI NE.

APPLICATION FILED AUGJB. 1911.

Patented Apr. 1, 1913.

8 SHEBTSSHEET 5.

I INVENTOR. 6min; BY'

PVITNESSES:

A TTORNE I.

G. (I. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED AUG. 18, 1911.

Patented Apr. 1, 1913.

8 SHEETS-811E111 6.

E @Q I 3 v9 QR I VITNESSES:

[NV v 19 7 ENTOR ATTORNEY.

G. J. BARRETT. TYPE WRITING AND GOMPUTING MACHINE.

APPLICATION FILED AUG.18, 1911.

Patented Apr. 1, 1913.

8 SHEETS-SHEET 7.

R 0 2 w Q 2 mw Q m I- Q2 V g 2 mp 3 N NM, i e 5, Q .z E. ..1 1|. 3 p wq m2 m: on 2 E Q: a s z I ATTORNEY.

Patented Apr. 1 191 3,

8 SHEBTS"SHEET S G. J. BARRETT. "TYPE WRITING AND COMPUTING MACHINE.

APPLIOATION TILED AUG. 18, 1911.

1 s c $1 9k Mn x on E4 w A tion.

1 UNITED smains PAT NT OFFICE.

GLENN J. BARRETT, OF GRAND RAPIDS, MICHIGAN, ASSIG-NOR TO THE SMITH PREMIER TYPEWRITER COMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

TYPE WRITING AND COMPUTING MACHINE.

Patented Apr. 1, 1913.

Application filed August 18, 1911. Serial N0.:Gl4,'i'36.

To all whomit ma-j concern Beitknown that I, GLENN J .Bannnr'r, citizen of the United States, and resident oi. Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements. in Type Writing and Computing Machines, of which the following is a specification.

My invention relates toacomputing ma chines and alsoto combined typewriting and computing machines.

The principal object of my invention is to provide an improved machine by which any words or numbers can be written and by which numbers written in connection with other typewritten matter can be subjected to computations, such as addition and subtrac I have provided computing mechanism in combination withthe mechanism ota wellknown typewriter, the two mechanisms being so combined that the typewriter can be used 'in the ordinary way and that a'number can.

be Written on the typewriter by a special set of numeral keys and added or subtracted by the computer, thecomputation orregis- ."ti'ation of the .nun1bers taking place simul tajn'eously with, andibein'g effected by the-"(le pression of s'aidspecial numeral keys.

My invention also contemplates the use of a plurality of registers so arranged and so combined with the other mechanism that any particular number can be added orsubtracted on any one of said registers or on more than one at the same time, if desired.

.My invention in cludes numerous improvements bothin computing mechanism itseli and in the connectionsbetween the computing and typewritmg mechanisms, all as \Vlll appear more fully hereinafter.

My invention consists in certain features of constructionjhndcombinations -and arrangements of parts which will betully set forth hereinand particularly pointed out in the claims.

One form of my invention is illustrated in the accompanying drawings in which- Figure 1 is a view in side elevation and partly in section and showing the general relative. arrangement of the .typeWrit-ing and computing machines (and some of the connections. Fig. 2 isa side elevation with the upper part of the typewriter broken 'away, with the rightghand side plate ofther computing machine removed, and with some parts in section. Fig. 3 is a top plan view on a greatly reduced scale oi? the keyboard of the typwriter and the part of the computer that projects out in front of the typewriter trame. Fig. i is an enlarged trap. nientary top view, partly in section and showing the construction of the register wheels and some of the associated parts. Fig, 5 is a top plan view of the computing mechanism with the typewriter removed and with a. few parts in section. Fig. (3 is a right-hand side elevation in section through the registers and with parts omitted and parts broken away. Fig. 7 is a detail side elevation of one of the register wheels and one of the transfer pinions. Fig. 8 is a view similar to part of Fig. 6 but showing the parts in the position they occupy when a key is depressed.

Fig. 9 is a side view of'partof the'denon'iination selecting mechanism and some of its connections. Fig. 10 is a top view of a denonii; HRtlOIliDiZilCfltOl. Fig. 11 is a fragmentary 5 I top view of one of the denomination select 1 ing keysof the computer and one of the tabulator keys of the typewriter and some, of the connections. Fig. 12. isa sidewiew-ot the same out showing,ral'so';a*pa1rt fof the register and certainjparts(itthe denonii'nm tion selecting mechanism and of its connections with the keys. Fig. 13 is a top view 85 of a certain shaft constituting part oi the denomination selecting n'iechanism together with a fragmentary showing of some of the connections. Fig.- la is a right-hand side view of .the same. Fig. 15 is a fragmentary top view ofthe key arrester. Fig. 16 is a view similar to a portion of Fig. '12 but with the parts in the positions they occupy when a key is pa rtiall depressed. Fig. 1? is a view of a portion of the same but showing the parts at the end of a key depression. Figs. l8, l9 and 20 are side elevations of one of the key, connections and showing the key ar= roster and full stroke device, the parts be-j ing in normal position in 18, at the end of the downstroke of the key-in Fig. 20, and in the midst of the downstroke of the key in Fig. 19. F ig. 21 is a detail side view of a certain key locking device. Fi 22 is a side view of parts of the i'egisfer operating mechanism when ajkey is at the limit of its downstroke. In this view the mechanism is in the act of adding f 9 on both registers.

i Fig.323 is a view similar to Fig. butshowing the parts in ndrmal position and showing also some additional parts not shown in Fig. 22. F igs.'24 and 25 are side views "partly in section and on an enlarged scale and showing one of the register wheels and its zero-setting pawl. Fig. 26 is a view partly in section. and illustratingthe zerosetting devices. Fig. 27 is a fragmentary "top plan view showing part of the connec- Smith Premier bottom strike typewriter.

This machine has a main frame 1 and a 'carriage 2 on which is mounted a roller platen 3., The carriage is drawnacross the machine by a spring drum in the usual way and its motion is controlled ordinarily by an escapement after the usual fashion of typewriting machines. This particular typewriter, is a full keyboard machine, that is to say, it has a separate printing key 4 for each character to be printed; and

each of said keys hasits stem 5 connected with an arm projecting from a rock shaft 6 pivoted in the framework. There are a H seriesof banks of these rock shafts extending from front to back of the machine and each of said shafts has an arm 7 to which is connected the lower end of a link 8 which at its upper end is connected with a type bar 9 carrying at its free end a type that is adapted to strike up against the under side of the platen 3. As shown in Fig. 3 there are in this machine eighty-four printing keys 4 and they include keys for printing capital and small letters, numerals and various other characters, so that the machine is adapted for writing any words and numbers. In this machine the numeral keys are arranged in two rows from back to front, one row at the extreme left of the keyboard and the other at the extreme right of the keyboard, the Zero being printed with the.

same key as the capital 0. Thistypewriter is also equipped with a. denominational tabulator. I mounted on suitable arms at theback of the carriage 2 and one ormore column stops 11 are gidjustably mounted on said bar 10 so as to locate a column at any desired position on the page. Cotiperating with the column stops 11 area series of denominational stops 12, :each consisting of the'upper end of a long lever 13, said levers extending up and dovgn behind the frame of the machine and frame to the computer frame.

A columnstop bar 10 is puter frame may be provided with rubber being pivoted at 14; to said frame. Thelevers 13 are connected at their lower ends to a series of push. rods 15 which extend forward beneath the frame of the typewriter and are guided at their forward ends in a bar 16. Each of the rods 15 has a tabulator key 17 mounted on its forward end, there being one of these keys 17' for each denominational position. By pushing one. of said keys toward the rear of the machine against the tension of a suitable restoring spring, the corresponding lever 13 is rocked about its pivot, bringing the stop 12 into the path of the stops 11. A universal bar 18 operated by the levers 13, releases the carriage from its escapement and allows it to run free until one of the stops 11 strikes the operated one of the stops 12, when the typewriter carriage is positioned for writing the first digit of a number, the precise position of the carriage depending upon the denominational value of such first digit.

I have not thought it necessary to show nor to describe in minute detail the construc-' tion of this typewriter as it has been extensively marketed and is well-known in the art and moreover, the exact construction of the typewriter is more or less immaterial t0 the present invention except insofar as some of theconnections shown in the present case have, been constructed with especial reference to this particular machine.-

My computing mechanism is mounted in a frame 20 of substantially, rectangular outline and is of substantially the same dimen-' sions when seen in plan as the typewriter frame 1, except that the frame 20 projects somewhat in front of the typewriter frame.

At the point marked 21 in Fig. 2, the typewriter frame is'provided with sockets for the rubber feet on which such machines ordinarily rest. I- have removed these riibber feet and provided on the computer frame short posts 22, shown in dotted lines in Fig. 5, which project into these sockets and properly connect the two machines, the type writer frame resting on thecompute'r frame. Alsoat the point marked 23 in Fig. 2 this particular typewriter has a vertical threaded. hole which is designed for the receptio-n'of a screw to fasten the machine to a base board or desk. I have provided a screw 2!? to be threaded into these holes, one on each side of the machine, to secure the typewriter Said com-z feet, if desired.

For writing and registerin those numbers which are to be registere I have revided at the back of the typewriter (eyboard a special set of numeral keys 25. These keys have long stems 26 extending- 23, each of the key stems 27is pivoted at its lower end toa plate 28 which is normally held by the spring 27 up against a station-- ary arresting bar 29 (Figs. 5 and 18). .All of said plates 28 are loosely mounted on a transverse rock shaft 30. At the rear of said shaft each of said plates 28 has'pivoted thereto at 31 a link 32 which extends horizontally toward the rear of the machine, its rear end being connected with an upright arm on a transverse rock shaft 34. Asbestshown inFig'. 5, there are ten of these rock shafts arranged in twosets at. the right and left-hand sides of the machine and each pivoted at its outer end in a frame bar 35 andatits inner end in a frame bar 36, said bars and 36 being connected to transverse bars 37, the whole constituting an auxiliary frame supported by lugs of the frame. 20. in addition to the-upright arms 33, each of the rock shafts 34 has a forwardly directed arm 88 into which is screwed a shouldered screw 40 (Fig. 28) that projects into a long slot 41 formed in the lower end of a vertical link 42, (which at its upper end is pivoted to an arm 43 projecting from one of the rock shafts 6 of the typewriter; This chain of connections, of-course, connects each of the numeral keys 25 with the rock shaft 6 that-is operated by the regular typewriter numeral key of corresponding value. The construction is such that :when. the typewriter key 15 operated and the shaft 6 rocked. thereby to operate the. tar .-Sl.e 4

e har,'--the link 42 moves down idly, the

fec .l'i'e' coin 'zuteri but-if oneof-the special numeral keys 25 be depressed, it both operates the com imterand also the corresponding type bar in the typewriter.

In 28 there is shown thcplate 28 that is connected to the zerokey and which occupies the right-hand endof the system, and it will beseen that this plateis in the nature of a lever of the firstordeif The next plate to the left. of it is that for the digit -9 and the other digits follow in regiillar order, the l key' being at the extreme left. with the exception of that for the zero key each of the plates 28 has a downwardly extending arm 44 having its rear surface 45 constituting a cam, and said cam terminating in an; open slot 46. These cams 45 are adapted to coiiperate with a series of fol lower rollers 47 each mounted on an arm and all of said arms are rigidly mounted on a rock shaft which 15 pivoted at its ends in the sidebars of the frame 20. As shown n l igi 28 the arms 48 are set at different angles on the shaft 50, the one operated by the 9 key projecting the greatest distance toward the front of the machine, andthe one operated by the 1 key: the least dis-' tance {to the front,-the construction being such-,1 that the 9 key will rock the shaft 50 idin 'over the screw '40 without at 'tion' they are moved toward the front.

to about nine times the extent of the 1 key and the other keys will each rock the shaft to the appropriate extent. In the present construction the cams 45 are all alike and the variation is made in the setting'of the arms 48. It will, of course, be understood that said arms can all be set alike if preferred and the cams 45 be varied. As

will be apparent from Fig. 26, the last part of the camv surface 45 constitutes a dwell 51 so that the shaft 50 is stationary during the last part of the 'downstroke of the key and the first part of the upstroke. It will also be understood that the slot 46 prevents overthrow of the shaft 50. Any suitable spring may be provided for restoring said shaft to normal position' As shown in Figs. 22 and 23 the shaft 50 has mounted thereon near its right-hand end a gear segment 52 which meshes with one of a series of pinions 53 on a transverse shaft 54 lying beneath the shaft 50 and journaled at'its ends in the frame 20. It will be perceived that when any of the nu meral keys 25 is depressed this shaft 54 will be turned to an extent appropriate tothat particular key. The registers are operated by a series of bars 55, one for each denomination. Each of said bars at its forward end has rack teeth 56 to mesh with the register Wheel and at its rear end each of said bars is forked, having an upper rack bar 57 that meshes with the upper side of a pinion 53 on the shaft 54 and the lower rack bar 58 adapted to mesh with the under side of the same pinion. will be understood by reforence to Fig. 5 there is'a series of these. bars 5 5 distributed across the machine 'and each extending in front and back direction, and there is a corresponding series of pin ions 53 distributed along the shaft 54. The parts are shown in normal position in Fig. 23and in that figure the racks 57 are shown in mesh with the pinions 53 and the racks 58 out of mesh. It will be seen that the racks 57 extend from the shaft 54 toward the front of the machine whereas the racks 58 extend toward the rear. 'As will hereinafter appear, theregisters are adapted to work equally well either way. In the present instance the numerals are arranged on the register wheels so as to effect addition when the racks 57- are in engagement as shown in Fig. 23, and subtraction when the racks 58 are in engagen'ient. It will be ap parentthat under one of these conditions the bars 55 are moved toward the rear when a key is depressed an'd under the other condi- It will be seen that the racks at the front of the bars 55 are sufficiently long to actuate the registers when said racks are moved in either direction from normal position.

v In order to shift the-bars 55 up and down to changefrom addition to subtraction and.

vice versa, the means shown in Figs. 2 and 22 are provided.- Each of said bars at its rear end is formed with a slot (30 into which a pin 61 projects from oneof a series of arms (32 which are rigid on a rock shaft 63, which shaft is pivoted at its ends in the frame 20. There isone of the arms (32 for each bar55. The rock shaft-($3 has an up wardly extending arm 64: to which is pivoted the rear end of a' long link which at its forward end is pivoted to'the depending arm 66 of a bell-crank which is pivoted to the frame 20 and whiclrhas also a horizontal arm 67 to which is pivoted the stem (38 of a subtraction key 70. The parts are held normally in the position shown in Fig. 3where :they are set for addition, this being-efie'cted by theweight of the bars which, if desired, may be supplemented by a suitable spring. The key stem 68 passes through a slot, in the top plate 71 (Fig. 2) which covers up theforwardly projecting part of the computer; and said key stem is formed with a hook or projection 72, which, when the key .70 is depressed, can be pushed back under the plate 71 and thus hold said key depressed and hold the parts in position for subtraction. hen it is desired to change back to addition the key 70 is pulled toward the front of themachine to release it.

From the foregoingdescription it will be seen that wheneverone of the .computer.

keys 25 is.,.depressed, all of the bars 55 are movedlongitudinally in unison and to an extent depending uponthe value of the op erated key. The bars. 55 at their forward ends are normally in a'depressed position as shown in Fig. 23 and they are elevated one at a time to bring them successively x of a horizontal lever 75, which at its .for-' into position to operate the register or registers as shown in Fig. 22, by denomination determining and selectingmechanism which will now be described.

Referring to Figs. 12 and 30, 78 is an angled stationary plate -fixed in the frame 20,

below the registers and below the forward ends of the bars 55. A vertical flange of this plate isr forme d with a series of cut-outs 74:,

of the form shown in Fig. 30, there being one of these cut-outs for each of the bars 55. Said cut-rout includes a vertical slot whichact's as a guide .for the forward end ward end carries a grooved guideroller 76 for the bar 5,5 and which at its rear end is pivoted at 77 to an arm 7 Srigidlymounted'onand projecting horizontally from a rock shaft 80 which is pivoted at its ends I in the fi ime 20. It will be understood that plea there is one of these arms 78 andlevers 75 for each denomination; At its forward end each lever 75 has an ear 8'1 bent offtherefrom over the top of the bar 55 to retain said her in position on the roller 76. Said lever. is-also' bent into au-shape, as seen from the front in Fig. 30, making a branch 82 between which and the main body of the lever the roller 7 (S is mounted, Said branch 32 has an ear 83 bent oif therefrom and adapted to rest on the top of the guide bar 73. The rollers 76 are elevated one at a time by rocking the shaft 80 toward the front of the machine, thus depressing all of the pivot points 77 and by interposing temporary fulcrums under the middles of the leforward ends; These temporary fulcra consist of pins 84 projecting in a spiral series from a rock shaft85 which is journaled at its ends in the frame 20. A detached top View of this shaft is shown in Fig. 13 where it will be seen that said shaft is provided not only with the spirally arranged pins 8% but.also with another set of spirallyarranged pins 86.- Each of these pins consists of a wire rigidly mounted in the shaft and bent off at its upper end parallel with the'shaft. -The/ two sets of pins can be distinguished by the fact that the pins 84 happins 86 toward'the left. The pins 86 are used for setting'the shaft- 85 as will pres ently appear. This shaft is also provided near its right-hand end with a pin 89 which operates a key lock that will be described pen to be bent off toward the right and the later on. In Fig. 12 and in some of the other figures, in order to avoid confusion,

I have shown only one of the pins 8& and

the'corresponding one of the pins 86.

The means for operating the shaft 85 to bring the desired or selected pin 84: into. operative position, can be understood by reference to Figs. 9 to 14 inclusive.

, Near its left-hand end said shaft has fixed thereon a pinion is constantly engaged by rack teeth formed on the under side of a bar 90 which at its forward end is pivoted at 91 to a lever 92 pivoted at 93 to a lug projecting from the frame 20 (Fig. 5). The lever 92 projects upward through a suitable slot in the cover plate 71 and it has a key 94 mounted there on. Above said plate 71 the lever 92 has an index pin 95 projecting therefrom and adapted to cooperate with a scale plate 96, (Fig. 10) screwed tothe plate 71 and marked to indicate denominational positions. The operator can tell at all times by reference to this index and scale in what denomination the mechanism is set to 0pthe te/nsion of said spring being exerte always to turn the shaft 85 in the direction of the arrow in Fig. 9 and to move the lever 92 toward the front of the machine. At its rear part the rack bar 90 is formed with a long slot 100 through which passes a pin prO ect-ing from the stationary framework to hold the rack bar in engagement with the pinion 87. The motion of the parts under ,frame 20' At its upper end the lever 10'4- is? connected by a 11111; 106 wlth an arm ofta'" the impulse of the spring 98 is normally prevented by a pawl 101 which is pivoted to the framework at 102, said pawl engaging the ratchet wheel 88. The shaft 85 can be turned in'a direction theopposite of that of the arrow in Fig-9 and against the tension of the spring 98 by pushing back the key In the operationof the machine said shaft is turned step-by step by means of a pawl 103 which engages the ratchet wheel 88 andwhich at its rear end is pivoted to thelower end of a lever 104 of the first order, which lever is pivoted at 105 to the plate'107 which is rigidly mounted on the shaft 30. lt will be recalled that this is the shaft on which arepivoted the plate's or levers 28 which are directly operated by the special computing and writing keys 26. The shaft .80 is rocked toward the front of the machine whenever one of said keys is depressed. To this end said shafthas a series of pins 108 (Fig. projecting therefrom, one such pin by the side of each of the plates 28, and each of said pins is bentoff in such a manner as to be moved. by said plate 28 whenever thelatter is operated. The shaft is restored to normal position by means bf a spring 109 connected at one end with an arm of the plate 107 (Fig; 9) and at its other-end to a fixedpart oft he machine. Them'otion of the shaft under the impulse of the spring 109 is arrested by a part ofthe plate 107 coming in contact with. the stop bar 29. The construction is such that whenever one of the keys 25 is depressed, the pawl 1'03 moves forward to take hold of a new teeth of the wheel 88 and on the upstroke of the key said pawl operates said wheel and turns the shaft 85 to bring the nextsucceeding pin as into its operative posit-ion shown, for example, in Fig.12.

It will be seen that the effect of theoperations just above described will be that'when the last digit of a number is written the.

shaft 85 will have been rocked as far as it will go on account of the limitation of the nio"v -.-ment of the rack bar Said shaft is set v the highest digitor the new number to be written by the snrin 98 act'in under the control of cer *1 finger keys.

Means. are provided wher theshaft 85 can be set under control "he nominatlonal tabulator Keys 17 ot v ,uter so that the computing,mcchanin will be in harmony wit-h th settingo'f the typewriter carriage. Means are also provided whereby said shaft 85 (3811b?) set independently of the typewriter carriage. A transverse rock shaft 110 is mounted above and a little back of the shaft 85, and a series of levers 111 o'fzthe first order are. piv

oted on said shaft 110 so that any one of said levers can be rocked independently of the others. Each of said levers is normally held in theposition shown in Fig. 12 by means of a restoring spring 112. Each lever 111 has at its lower end a forwardly projecting toe 113 which is-adapted when the lever is rocked to be moved into the path of one of the setting pins SG which project from the shaft 851- The levers 111 are operated by slides or plates 114C (Figsdl and 12) mounted on top of the plate 71 by screws 115 passing through slots 116 in the slides 11 1. Each of said slides has atits' rear end a notch that engages the lever 111 and each of them at its'forward end is bent up to form a ush key 117 which calf be operated direct y by the finger. The up turned forward end of the plate 114 also .includes a branch 118, leaving a slot or notch between said branch! and the key 117 through which slot or notch the push rod 15- of one of the typewriter tabulator ke'ys 17 passes. The construction is such that when one of said tabulator keys is pushed to the rear to position the typewriter carriage, it, in the latter partl'of its stroke, 0 erates the plate 114 and sets the shaft 85 n liar-- mony with the setting of the typewriter: carriage The construction is also such that the two sets of keys are connected anddisco nnected by' the mere act of setting the typewriter on the computer frame and removing said typewriter from said frame.

' arn'is cause the shaft 110 to rock in unison The shaft 11.0 is arranged to be rocked by I with the-operated one of the levers; Near its left-hand end the shaft 110 has-an arm 121 projecting therefrom downward and forward (Figs. 5 and-9) and said arm has a pin 122 projecting therefrom through slots in the pawls 101 and 103. The construction is such that when the shaft 110 is rocked by one of the levers 111, these pawls",

are lifted out of the ratchetwheel 88, leav-' ing the shaft 85' free to be tumedby the spring 98 until arrested by one of'thepin's 86 striking the toe 113 of the operated lever 111. When the key 17 or 117 is released;

the' shaft is restored to the control of'the pawls. In setting said shaft in th described, the lever 92 will of course move toward the front of the machine and it will be 'fed backward step by step by the pawl 103- as the keys are operated. Meanwhile the typewriter carriage is also .being fed forward by its escapement so that each number written on the typewriter isadded or subtracted in the corresponding denominatlon m'the computer.

The means for operating the shaft 80 at each key stroke, are best shown in Figs. 12,

I 16 and 17. Said shaft 80 is operated by an indirect connection with the shaft BO of such character as to rock said shaft in the shafts and 80 is snapped oft so as to drop the operative oneof the bars down to inoperative position before said bar begins to move longitudinally to normal position.

- The plate 107 has a branch or arm 1 23, the

upper end 124 of which normally stands above the shaft 30, as shown in Fig. 12. At 124 said arm has pivoted thereto a link 125, the rear end of which is pivoted at 126 30 to a cam plate 127 which is pivoted at 128 to the frame 20. The cam plate 127 has its rear edge comprising two concentric parts or dwells 130 and 131,'the latter of greater radius than the former and said dwells connected by an incline. 132. This cam edge operates on a follower roller 133 which (Fig. 12) normally rests against the dwell 130 and in position to be moved toward the rear by the incline 132 in thefirst part of the down stroke of a key 25- T l 133 is mounted in the vertical arm of a bell crank 134 which is pivoted at 135 to the frame 20, the horizontal arm of said bell crank being connected with a restoring spring 136. The vertical arm of said bell crank has an ear 137 bent ofl'therefrom and normally engaging a notch in a pawl or latch 138 which is pivoted at 140 to a lever 141, said lever being pivoted to the frame 20 at 142. The restoring spring 136 is also connected with this lever 141 and normally holds it against a stationary stop pin 143, the tension of said spring being exerted to move thelatch 138 toward the front of the machine. Said latch is pressed up against the ear 137 by means of a spring 144 connected at one end to the latch and at the other end to the lever 141. The lower end of said lever 141 is connected by a link 145 with an arm 146 depending from the rock shaft 80. The construction is such that when the shaft 30 is rocked by the depression of a key the cam plate 127 moves the bell crank 134 and said bell crank, acting through 'its ear-137 and the latch 138, rocks of the key, this dog sna-ps' past the finger 152, being freeto turn for that purpose against the tension of its spring. 151. This position of the parts is shown in Fig. 17.' In the first part of the return stroke of the ,key said dog depresses the finger 152, mov-- The dwell 131 ing the notch of latch 138 outof engagemcnt with the car 137 and allowing the lever 141 to be swung by its spring 136 to move the link 145 toward the front of the machine and to restore the shaft/80 and the levers '75 to their normal positions. It will be recalled that the last part of each of the cams 45 consists of a dwell so that the rack V bars 55 do not begin their longitudinal motion toward normal position until after the latch 138 has been tripped oft. \Vhen the parts resume their normal positions shown in Fig. 12 the latch 138 snaps back into engagem'ent with the ear 137 ready for another operation.

In order to render the denomination se lecting mechanism inoperative and thereby to render inoperative the entire computing mechanism, the scale plate 96 has near the rear end thereof a notch of such sort that the lever 92 can beforced slightly to the right and into said notch and that is the position of said lever shown in Fig. 10.

\Vhen the lever 92 is in this locking notch the rack bar 90 and the shaft 85 are locked against motion and the shaft 85 will remain in its normal position even though one of the tabulator keys 17, or one of the finger keys 117, be operated. The tabnlator vof the typewriter can then be used without aifecting the computing mechanism. When the parts stand in the position shown in :Iiigs. 9 and 10, none of'the pins 84 is in operative position.

In orderto lock the special keys when the shaft 85 and connected parts stand as shown in Fig.2, a key lock is provided which will be understood by reference to Fig. 21.. On some convenient part of the machine, in the present instance on the shaft. 110 near the right-hand end thereof,

a lever 153 is pivoted, said lever hanging down behind the shaft Said lever 1s connected by a link 154 with a hook 155 in the plane of rotation of .the pin 89 hereinbefore referredto as niounted'on the shaft 85, and the hook 155 stands inthe plane of an arm 157 projecting from and fixed to the shaft 30. hen the shaft 85 stands in the position shown in Fig. 9, the pin 89 stands in the position shown in Fig. 21 where it forces the lever 153 toward the rear, thus moving the hook 155 untler the arm 157 and locking the shaft 80 against' oscillation and therefore locking the keys 25 againstdepression. The shaft 85 is turned during the up-stroke of any key 25, and said shaft assumes the position referred to, afterlthe operation of the register wheel of lowest o'der. The locking of the keys at this time will prevent the operator from 'making the mistake ofloperating another key before resetting the denomination se leotin mechanism. The in 89 also stands in the position shown in Fig. 21, when the lever 92'stands in the extreme forward. end- :of theislotj in the plate 71. In other words,

the motion'of this lever from one end of the slot tothe other imparts just about one complete rotation-to the shaft 85. It important that the keys be locked when the lever 92 stands in its extremeforward position because this is one step farther forward than it is intended this lever stand at any time, but the'parts could escape torthatposition by an improper operation of the keys 117. If, for example, the key 117 for the thousands position be first operated and afterward the key forthe tens position be .)pe rate d, the 131N486- which' should arrestthe shaft 85 in the tens position ivillalready j have passed the toe113 of the correspond; ing lever 111. The result will be that the shaft willbe released but it will'not be arsition that is farther forward than it is desired to have it, it can be pushed back to the desired position by operating the key 9 1. In this case the pa-Wls 1'01 and103 will snap over the teeth of the ratchet wheel 88 and will retain the shaftin its set position.

The keys 25 are under the control of a key arrester, shown in Figs. 15. 18,. 19 and 20, for preventing two keys from being depressed at once, and for preventing one key from being depressed until. the previously operated key has been restored to normal position. A plate or bar'158 is mounted at its ends in lugs projecting from theframe 20, said plate lying below and in front of the shaft 30. Theplate-158 has its rear edge rolled back to form a tubular part 160 which contains'a. set' of balls 161 which are held in, said tubular part by pins 162, one at each end of the series of balls. Slots 163 are out in the plate 158 and each of the levers 28 has a segmental part 164' with a beveled end 165 that is adapted to play in said slots 163 bet-ween the balls 161. The parts are so proportioned that when one of the arms 16 1 lies between two of the balls 161 the pins 162 will prevent any other pair of balls from separating to a suiticient extent to allow of the depression of an-' other key. Each of the plates 28 is also controlled by a full-stroke device. To this end each of the segments 16% has a series of notches cut in its forward edge and a full stroke pawl. 166 pivoted to the plate'or bar 158 cooperates with these notches or with-the teeth between the notches. 'il'he pawls 166 are controlled by springs 16? connected to a flange 168 bent up from the bar 158. Said springs tend to bring the pawls each to a middle position shown in;Fig. 18, in which figure the parts-are in normal position. When one of the keys25 begins to move downward, the pawl 166 begins to snap over theteeth as shown in Fig. 19 andv thus prevents the return of the key to normal position until it has reached the bottom of its stroke as shown in Fig. 20. At this time the pawl 166 has escaped from the notches 165 and said pawl is re versed on the tip-stroke of the key, acting to'prevent a second depression of the key until said key has completed its tip-stroke.

This device insures the completion hf both the registering and the printing operations.

I contemplate if desired the use of a plurality of registers which can be operated' either singly or more than one at a time. Two registers are shown in the present instance but others can be added, necessitat ing, however, the lengthening of the rack bars 55; The two'registers shown are identtical' in construction except that the parts of one are arranged in a reverse manner compared with the parts of the other in this respect, namely, that the wheels of the forward register are back of. the other parts of said register, whereas the wheels of the rear register are in front of the corresponding parts of said rear re 'ister. This arrangementis not-necessary, but it is convenient where only two 1 'e .ters are employed be cause --it gets the closer together and therefore does not Ft" quire quite long a rack bar i will describe the forward one of two registers and this will enable the construcregister wheels little ing the mechanism of the register. A shaft 172,- lying directly in rear. of the shaft 170, isjOurnaIed" in the several plates 171 and said shaft 172 has'registerwheels mounted 5 on' it, there being one-register wheel' between each two 'consecutiveplates 171. The construction of these register wheels can be 1 best understood by'referen'ce to Fig. 4 when 5 the various parts of the wheel are assembled,

' as will be understood. The ,sleeve 173 at'its extreme right-hand end has a bearing on the shaft 172 and the remainder of said sleeve or hub is preferably bored out to a diameter greater than that of the shaft, and in the extreme left hand end of this bore a short, headed collar 174 is inserted, this collar constituting the left-hand bearing end of the sleeve and the head of the collar serving to retain certain of the parts in position on the sleeve. 17 5 represents the drum on which the numerals are printed. 176 is the pinion that is adapted to be engaged by the rack bar 55. 178 and 180 are two disks constituting elements of the transfer mechanism, which transfer mechanism as shown in the present instance is one variety of Geneva stop motion. The two disks 178 and 180 are separated by a washer 181. 182 is another gear wheel constituting an element of another transfer, namely, that between the particular wheel under consideration and the next one of lower order. In Fig. 6 the section is t-aken just to the left of one of the drums 175 and this figure shows the disks 180 and 178 of the wheel through which the section is taken. and-the gear 182 and pinion 176 of the next wheel to the left. The connecting elements of the Geneva stop motion are journaled on a pin or short shaft 183 which is mounted in a lever 184 pivoted at its lower end on a screw 185 threaded into the lower part of the partition plate 171, this lever being movable so that the Geneva wheel can be moved out of .engagement with the two registerwheels. The lever 184 has in ear 186 bent elf therefrom and a spring 187 connects said ear with another ear 188 bent off from the partition plate 171, the tension of this spring being exerted to hold the elements of the Geneva motion in gear. The motion of the parts under the impulse of-said spring is limited by an arm 190 ofthe partition plate 171, said" arm being so formed that it can be adjusted by bending it. The lever 184 has pivoted thereto at 191 a locking lever 192, which lever is controlled by a spring 193 connected thereto atoneendend at its 5 other end connected to an arm.194 of the letion in engagement. Anyone of these locks,

the ear 186 of the lever 184.

ver 184. Each of the levers 192 has a forwardly extending arm, the forward end of which is stepped as shown in Fig. 6- and the lowest step of said arin normally cooperates with a small bracket 195 which is secured totheshaft 170 and depends in the posi-' tion shown. This bracket 195, cooperating with the stepped-in lever 192, positively locks the lever 184 against rocking and posi- .tively holds the two parts of the Geneva mohowever, dan he released by elevating the rearwardly extending arm of the lever 192. Said rearward arm lies over a pin 196 projecting from the side of the U-shaped end of one of the levers 75, as shown in Figs. 6 and 30. The construction is such that when said lever 75 is operated to raise the rack bar into engagement with the pinion 17 (3 the lever 192 is also rocked and released from the bracket 195. The forward arm of said lever. has a lug 197 thereon "which, when the lever is rocked, comes in contact with As soon as these parts touch, the lever 184 is compelled to rock with the lever 192 and it'is thus forced forward, moving the Geneva wheel away from-the register wheels. Preferablythe lever 184 is bent horizontally at its top, said horizontal portion extending across the partition plate 171, being bent downv at its right-hand end to form a right-hand hearing for the pin or axle 183; The Geneva wheel is thus journaled between thetwo branches of an inverted U-shaped support.

198 and 200 are star wheels meshing respectively with the disks 178 and 180 and at 201 there is a pinion meshing with the gear 182 of the nex'thigher denomination. The disk 178 and the star wheel 198 cooperates 105 tolock the Geneva wheel except when pass ing from nine to zero, or from zero to nine. The parts are shown in the midst of this operation in Fig. 7. ln said figure it will be seen that the disk 1'80 -has one tooth 202 which is a starting tooth cooperating with the teeth of the star wheel 200 to start the Geneva wheel. Even with the middle of the tooth 202, the disk 17 8 is formed with a' notch 203 into which one of the teeth of the star wheel 198 passes when said star wheel .isstarted by .the tooth 202 cooperating with the wheel 200. This notch 203 acting on one of the teeth on the wheel 198 completes the motion of the Geneva wheel which motion is, of course. connnunicatcd to the next register wheel of higher order. By reference to Fig. 6 is will be seen" that there is. a little lost motion between the tooth 202 and the first tooth of thestar wheel 200. The Geneva motion is so designed as to impart to the wheel of higher order one telfth of a turn' by a motion of about one twelfth of a turn on the part .of the wheel of lower order. This difierence enough to take up any lost motion in the train of gearing gso that in the case of transfer along-a rowof nines the transfer will take place promptly throughout the series. I

The rear register has its levers 192 lying on the same pins 196 asthe corresponding levers of the forward register as shown in Figs. and30. Each'register frame is pivoted by reason of the fact that the shaft 170 :is, pivoted at its ends in the frame 20. The two, registers are normally held up in inoperafive position by means. of a spring (Fig. 6) which connects the lower parts of the two frames near one end. The registers normally stand so high that the pinions 176 will notbe engaged by the raclg bars 55 even when the latter are elevated in a manner which has been described. Inorder to depress either register frame or both' to operative positioneach of said register frames is provided with a key 205, the stem of which passes through a suitable-slot in the 'd'epresse'd position. It will be seen that either register can bemoved down to operative position or that both, can be so moved. It w1ll also be perceived that other registers can. be mounted in the machine in a similar fashion and operated by the same rack bars 55.

In order to set the registers to zero each of them is provided with a milled head 208 mounted on the end of the shaft" 17 2, which -shaft projects through a slot in the side of the casing for this purpose. As shown in Figs. 24, 25 and 26, the shaft 172 at its left-handend passes through a hill) or collar 210 rigidly 'mounted" on the extreme lefthand one "oft-he plates 171. Said collar has anjopen-longitudinal slot 211 into which a pin 212 projects from the shaft 17 2. At the right of the registe'r frame said shaft has rigidly mounted thereon a collar 213 coui1- terbored, asshown in Fig. 26 for the reoeption of a spring 214 which is coiled about theshaft and compressed between the bottom of the counterboreand the right-hand plate .171. This 'spring 'holds the shaftin its in the bottom of the slot 211; and said shaft.

right-hand position with the pin212-seated can be pushed-to the'left until said pinis out of said'slot; when the shaftcan be iven a complete turn to bring the register w eelsto zero. Each of said register Wheels has mountedlin' the drum -.17;5Jthereof. a-pawl 215' which" is pivotedto said at .216 which at its transverse slot-cut by Letters Patent, is

in the hub 173 so that the free end of the pawl can engage the shaft 172 toward which it is pressed by a spring217. Said'shaft has .a series of notches 218 out therein and each normally standing a little to the right of one of the pawls 215, as shown in full lines in Fig. 20. When said shaft is pushed to the left.these notches go into position to engage the pawls, as shown in dotted lines in Fig. 26, and when the shaft is turned the register wheels are picked up and carried to zero. These.- wheels are normally locked against rotation by the transfer mechanism In order to unlock them for the purpose of setting them to zero, the key 205 is capable of being forcibly depressed to move the register frame down farther than its operative position. The effect of this extra downward motion is to cause the levers 192, by reasonof their contact with the pins 196, 35

to be rocked about their pivots to a sutliciei-it extent to unlock the register wheels. These levers auton'iatically return to locking posi'- tion when the pressure on the key is released.

Some of the features of the machine de- 96 scribed herein are shown in somewhat different forms n prior applications of mine,

and said prior applications contain claims that read on the present construction.

It will of course be understood that various changes. can be made in the details of construction and arrangement without departing from my invention, thatparts of the invention can beused without other parts,

and that some of the features'of the inven- 106 tion can be used in .machinesdiifering considerably in other respects from the specific machine here shown and described.

What I claim as new and desire to secure 1. In a computing machine,- the combination of a'series of denominational devices, a group of numeral keys common to said de vices, denomination selecting mechanism ineluding-a part that moves step-by-step as 110 said keys are operated, means for setting said denomination selecting mechanism for the first denomination of a numbento be registered, and means for locking said numeral keys except when said denomination selecting mechanism is set to correspond to some denomination.

s- 2. In a COIllblIlBd. typewritingarrd coinputing machine,- the combination of a type- Writercarriage, computing mechanism in- 12o.

eluding denomination selecting mechanism, I said denomination selecting mechanism m eluding apart movable step by step independent yofthe typewriter carriage, de-

nominational t-abulator mechanism for po- 126 .sitioning'said carriage,'a spring for operating'jsaid step by step moving part, stops cont-rolled by said tabulator'keys for ar resting saidpa'rt in harmony with the posi- .tion of the typewriter carriage, keys for 1 3a operating said computing n echanisnnand means for locking said keys in. case said step by step movinglpart escapes trom said stops. I

In a combined;typewritingand computing machine, the combination of a typewriter carriage, computing mechanism including denomination selecting mechanism,

said denomination selecting mechanism inback to set position in case suci' part es-v capes from said stops.

4. In a combined typewriting and computing machine, the combination of a: typewriter carriage, denomination selecting mechanism for the computingv machine operating independently of said"'typewr1te1 carriage, denominational tabulator mecha nism for positioning said; typewriter carriageand said denomination selecting mechanism in unison, and means for locking said denomination selecting mechanism so that said tab'ulator mechams-m can be used to position the typewriter carriage without affect ingthe computing mechanism.

5. In a combined typewriting and com "puting machine, the combination of a typewriter carriage movable step by 'step denomination selecting mechanism for the computing mechanism including a part movable step by step independently of the typewriter carriage, a spring for operating said part, means for hold ng said part agalnst the tension of: said sprlng, denominational .tabulator keys, means whereby said keys when operated position the typewriter can riage, means whereby any of said keys releases said holding- .means, stops operated by saidkeys f r arresting said part in dif- 'ferent denominational positions as desired,

and means for locking said part so that said ta'hulator keys do not position said denomination selecting mechanisnz/ 6. In a combined typewriting and computing machine, the combination of a typewriter carriage, denomination selecting mechanism for the computing mechanism, means for moving said carriage step 'bv step, independent means for moving a part of said denomination selecting mechanism step by step, tabulator mechanism for positlcnm said typewriter carriage, connections rem said tabulatormechanism to said; I i

step by step moving part for D ()-1tlOn 1-g can be used to position the typewriter car- 'tabulator for said carriage, denomination saidspart in harmony with the typewriter carriage, and means for preventing said part from being positioned by I said tabulator mechanism so'that the tabulator mechanisnr riage without affecting the computing mechanism. p

7. In a combined typewriting and computing machine, the combination of a car riage in the typewriter, a denominational selecting 'mechanismin the computer and including a device that moves step by step lator for setting said step by step mov ng device, and means torset'ting said device independently to any desired denominational position.

8. Ina combined typewriting and computing machine, the combination of a car: riage inthe typewriter, a denominational tabulator for said parriage, denomination selecting mechanism in the computer and including a device that moves step by step independently of said typewriter carriage, said denominational tabulator having a series of keys, a series of keys for setting said step 7 by step moving device, and means whereby the'keys of one set operate those of the other set.

9,'In a combined typewriting and computing machine, the combination of a typewriter frame, a computerframe, means for connecting the two frames, a tabulator in 100 the typewriter, denomination selecting mechanism in the computer, hand operated means for. setting said denomination select-ing mechanism, and means for connecting said hand operated means and said 105 tabulator when the two frames are connected.

10. in a combined'typewriting and computing machine, the combination of typewritingmechanism including a traveling carriage, tabulator mechanism for arresting said carriage at different denominational positions as desired, computing mechanism' including a shaft having spirallyarranged independently of said typewriter carriage,

means controlled by the typeWritentabu- 8O denominational determining devices there- 15 on, a spring for rotating said shaft and means controlled by the tabulator mechanism of the typewriter for arresting said shaft in different positions corresponding to the different positions of arrest of the typewriter carriage.

11. In a combmedtypewriting and computing machine, the combination of a typewriter carriage, movable step by step, tabulator keys and connections for arresting, 5

said carriage in. different denominational positions as desired, computing mechanism having a shaft, denomination determining devices arranged spirally 'onsaid sl raft a spring for rotating saidsh aft indepeen y of the typewriter carriage, means for movingsaid shaft step by step, and means controlled by, said'tabulator keys for setting I said shaft to 'diflferent denominational posiputing machine, the combination of atypewriter" carriage movable step by step, tabulater keys and connections for setting said carr-ia'ge to different denominational posi-'. '.tions as desired, computing mechanism com- 1 prising denomination selecting mechanism,"

and said denomination selecting mechanism including'fa shaft, stops arranged spirally on 1 by said tabulator keys.

said shaft, and coeperat-ing stopscontrolled 13. In a. combined typewriting andcom- ,putingma'chine, the combination of -a typewriter carriage movable step by step, tabulato-r keys and connections for setting said carriage to different denominational positaons as desired, computingmechanism comprising denomination selecting mechanism, and said denominatlon selecting mechanism "including a shaft, stops arrangedspirally on'said shaft, cooperating stops controlled 35" controlling said cooperating stops to. set

id tabulator keys, and special keys for saidshaft independently of the typewriter carriage. r 1 '14. In a computing machine, the combination of a register, means for actuating said register one denomination at a time, denominat on selectm mechanism CO'mPIIS- mg a shaft, a spring; or turning sa d shaftin one direction,"st-ops spirally arranged onsaid shaft, means for arresting said shaft by any desired one of said stops in order to set said denomination selecting; mechanism at any desired denominationalposit-ion, and

"means for turning said shaft 'step-by step ggainst the tensionof its spring at each "operation of '.the register.

15. In a computing 'mach'ine,.the combination of a register, a single group of keys co-mmo n to all denominations, denominationselecting mechanism including a shaft, a

- writerv carriage, a set of numeral keysspring for turning said shaft in one direction, means for setting said shaft at any desired denominational position, and pawl and ratchet mechanism operated by said keys for turning said shaft step by step against the tension of said spring.

1 6. In a combined typewriting and computing machine,--the combination of a typenism including a part settable to diiferent denominational positions, a. spring for moving said part in one direction, means for holding said part in difi'erent positions, means operated by said tabulator keys for releasing said part and arresting it in different denominational positions, and means operated by said printing and computing keys for moving said part step by step independently of said typewriter carriage and against the tension of said spring@ 1-7. In a computing machine, the combination of a register, a single group of numeral keys common to all. denominations, denomination selecting mechanism. including-apart movable step by step from one denominational pos tion to another, a spring for moving said part in one direction, a pawl for holding said part against the tension of said spring, a second pawl operated by said numeral keys for moving said part step by step against the tension of saidv spring, denominationselecting keys, means operated by any of said' keys for releasing said pawls, and stops operated by said keys for arresting said part in different denominational positions; 1 I l8.'I11a computing machine, the combination of a series of levers, means for operatv mg all of said levers, rock shaft having a vspirally arranged series of pins projecting therefrom, one pin for each lever, and adapted to be brought one at a timeinto a position ,for modifying the motion of-said levers, a second series of pins arranged spirally on said rock shaft,-and means coiiperating with said second series of pins for setting said shaft-f 19. In a computing machine, the combina tion of a seriesiof register wheels, a single and denomination selecting mechanism comprising a part movable step by step as said numeral keys are operated, a hand lever connected to move in unison with said step bystep moving part and c'a-pable of manipulation to set said part, a scale associated with said lever and a pointer mounted on said lever and ,coiiperating with said scale to insele'cting mechanism puting machine, the combination of typegroup of keys common to all of said wheels,

dicatethe denominational position in which n nation of a series of register wheels, a sewriting mechanism including a series of pr nting keys, a series of type bars and connections irom'said keys to said type bars,

ries'o-f rack bars normally out of position to operate said wheels but movable individually into operating position, I a series of levers each arranged to guide one of said rack bars, means for operating all of saidlevers,

andineaiis for interposing an abutment that acts as a fulcrum for one of said levers .whereby that particular lever is caused to move its rack bar into operating position.

23. In acomputing machine, the O0H1l)1 nation of a series of register wheels, a series of 'ack bars for operating said register wheels, said rack bars normally; out of op, erating position, a series of levers each ar ranged to guide one of said rack bars, means for operating all of said levers, a series of fulcrnms for said' levers, and means for rendering said fulcrums operative one at a time.

24. In a computing machine, the combina- I tion of a series of register wheels, a series of rackbars for said register wheels, said rack bars normally out of operating position, a series of levers each arranged to guide one of said rack bars, means for operating all of said levers, a spirally arranged series of fulcrums' for said levers, and means for turning said series of fulcrums to bring one after another of said fulcrums to operative position.

25. Ina computing-machine, the combination of a series, of register wheels, a series .of rack bars foroperating said register wheels, said rack bars normally out of operating position, a serieslof levers each arranged to guide one ofsaid rack bars, an oscillatory member towhich all of said levers are operatively connected, and means for interposing the fulcrums into operative relation with said levers selectively.

26. In a computing machine, the combination of a series of register wheels, racks for operating said whee-*ls,-a grouppf keys common to all. denominations and arranged to ope ate said racks, a dam and follower-op erated byany of said keys, a series of levers for controlling said racks, denomination se lecting mechanism including means for interposing. fulcrums for. said levers succesmon to all denominations and sively. and means operated by said 'lollowcrfor operating all of said levers.

27. In a computing machine, the combination of a Series of register wheels, racks for operating said wheels, a group of keys cominonto all denominations and arranged to operate said racks, a cam and follow er -op- 'erated by any ofsaid keys, a series of levers for controlling said racks, denomination selecting mechanism includingmeans for inter-posing tulcrums for said levers successively, means operated by said follower for operating all of said levers, and a trip-ofii' connection between means.

28; In a computing machine, the combina-v tion eta series of register wheels, racks for operating said wheels, agroup of keys common to all denominations and arranged to operate'said racks, a cam andfollower operated by. any of said keys, a series of levers for controlling said racks. denomination selecting mechanism including means for int-erposing fulcrums for said levers succes sively, means operated by said follower for operating all of said levers, a. trip-oil connection between said means and said fol lower, and means for tripping said connection at, the first part of the lip-stroke of a key.

29. In a computing-machine, the combt nation of a series of register wheels, racks for operating said wheels, :1 group of keys common to all denominations and arranged to operate said racks, a cam operated by any of said keys, connectionswhereby said cam brings one of said register Wheels and its rack into gear in the first part. of the down stroke of a key and i'naintains them in gear.

said means including a trip-oft device, and means'acting on the up stroke of the key for tripping said trip-oft device 30. In a computing machine, the llll)lh21 tion of a series of register wheels, racks for operating said wheels, a group of keys C0111- mon to all denominations. and arranged to operate said racks, a cam operated by any of said'ke-ys', connections whereby said cam brings one of said register wheelsand its rack into gear in the first part of thedown stroke of a key and maintains them in gear. said means including trip-oil device and a pawl pivoted to said cam and acting in the first part of the up stroke of the key to trip oil said device.

3l. In acompnting machine, the combination'ot aseries ot register wheels, racks for operating said wheels, a group of keys coinarranged to operate said racks, a cam operated by any of said keys, atollower for said can). a lever said follower and said I and connections-tor bringing one ot' said register wheels and its rack into gear, a pawl connecting said follower and said lever. and means for tripplng said pawl 

